Steam boiler



J. KEM NAL STEAM BOILER Nov. 17, 1931.

4 Sheets-Sheet 1" 7 Filed March 20, 1925 "h ATTORNEYS.

J. KEMNAL Nov. 17, 1931.

STEAM BOILER Filed March 20, 1925 4 Sheets-Sheet 2 INVENTOR W MATTORNEYS.

J. KEMNAL STEAM BOIILER Nov. 17, 1931.

Filed March 20, 1925' 4 Sheets-Sheet 3 00000o000c1'oo0000 INVENTOR Wm W4A'TTOFQN 90000000000000 )OOOOOOOOOOOOOOOOOOOOOGOOOOO Nov. 17, 1931. JKEMNAL 1,832,029

STEAM BOILER Filed March 20, 1925 '4 Sheets-Sheet 4 {M ATTORNEYS KimmieWei ewe Lei; WEDGE, ENGLAND, TU? LBAJECGCK d2 W'ILGCJX SGM- FAQ? ,1,{33F BAYQINEIE HEW GQIELIFPUHATEON 01E LEEBBIJY filee filfiereii 20, 19%Ho 1%,8231, em? in Great Britain. July wee rig ehhese which haveprovision 1 i? s'iieem from between nes and the izke, and

A di'evaqngs in Li-mi eievetlon when, such seeeieveeien of v v CW5.

ueii i have adopted; for purfurnace chamber 11) 1s A" "tubes 14, the bei 1 entire setting f0 ShQW-Hi best A "ending eniy v e mg, eiso as shown.best mph s hemiheeciers l6 which sum, he dowuizeke headers 1'5 18 of theupper ioenk l i take headers 1'? are nippieei t0 the Water drum. 1.9 inthe usual mare simulating tubes 20 eemieei; the T "eeieis 18 with thedrum 19. A. pipe ieeim from the drum 1% to the intake 7 e-if ekesuperheei'ei' 13, the steam ieeviug the euiziell; heeoier 23 through thepipe 24: fie the point of use. Above the boiler e gas flue 25 extendingacross the b0iler, such iiue dieeceimg the horizontally iueo 'ehezippei" end of e We flue QKi-Which leads to the lower ends of the tubes27 of e combustion eii" heater leeeted the rear of me ieeiiei theeombuetieu e5 to iseheeieei e are connected to "iiOWBi 7101 u.

iuieipipe and leaving shrough "ciie eueiet was 37.

i Q bo 'h dampers 33 eir iowermost pesitien then M 1 1 the furnace rise'verriiceiiy, ever the low l2 1 i-ier 13 end. then. ovmiie esition'ngthe dampee 33 e 1' ii; sous time the distribution oi tween the reheeter35 euci the u es J; be drawn to its closed pee gases will flow acrossthe upp ee'iz efiieetiiig the reheeter. damper 33 is drawn t0 its (:10the damper 34; "fully open s wiii pass over the reheeter 35 er pass overthe upper bank li. The d M; 33 and 3 1- may be set to any ciesirediPGSi'e'Li-Qfi to regulate the degree of i'eheetin in the reheeterfiSvdS1f6d the. remewiieg flowing over the upper Tee. M.

Regardless of the setfiiug of ihedemners 33 and 3%, all oi? the gaseswill pass evei- Lilia superheetei' 13 and While they be (iivercted inpert from one side of the supeirheete1" to the other, the amount ofsuperhee; obmined. from-thev superheater 13 will not be materiallyvaried thereby; Ali ef the) gases will alsoflow over the air heaterregardless we of the setting of the dampers 33 and 34, so that any wasteheat will be returned to the system through the combustion air. The portion of the furnace chamber containing the lower bank of tubes 12 andthe superheater 13 provides a single pass for the furnace gases, whichtermlnates in two passes disposed in parallel and which in turncommunimerely illustrative and the embodiment of my invention may bewidely varied.

This application is related to my copending application Serial No.705,211, but it is to be understood that I do not intend to claim hereinany of the subject matter defined in the claims of said copendingapplication, and the claims herein should be construed according'ly.

I claim:

L A steam boiler having horizontally inclined water tubes, said tubesbeing divided into a lower bank extending across the boiler for the fullwidth thereof, a superheater in the lower bank, an upper bank at oneside of the setting, a reheater above the lower bank and alongside theupper bank, a vertical dividing wall between the upper bank and thereheater and extending to the gas outlet of the boiler, a damper at theboiler gas outlet for the passage containing the reheater, and a damperat the boiler gas outlet for the passage containing the upper bank.

2. A steam boiler having horizontally inclined water tubes, said tubesbeing divided into a lower bank extending across the boiler for the fullwidth thereof and an upper bank at one side of the setting, a reheaterabove the lower bank and alongside the upper bank, a vertical dividingwall between the upper bank and the reheater and extending to the asoutlet of the boiler, a damper at the oiler gas outlet for the passagecontaining the reheater, a damper at the boiler gas outlet for thepassage containing the upper bank, and an air heater arranged to receivethe gases from both of said passages and ducts to lead heated air fromthe air heater to the boiler combustion chamber.

3. A steam boiler having horizontally inclined water tubes, uptake anddowntake headers for the water tubes, a steam and water drum,connections between the headers and the drum, a gas exit flue having itsentrance above the connections between the up take headers and the drum,said water tubes being divided into a lower bank extending 1,ssa,oae

across the boiler for the full width thereof and an upper bank at oneside of the setting, a superheater in the lower bank, a reheater abovethe lower bank and alongside the upper bank, a vertical dividing wallbetween the upper bank and the reheater and extending up to and into thegas exit flue, whereby the furnace gases will flow in a continuouslygenerally upward direction over the lower bank and then into thepassages formed by the vertical wall, and a damper for each passage atthe upper end of the vertical wall, whereby the quantity of gasesflowing through the respective passages may be regulated.

4. A steam boiler having horizontally inclined water tubes, uptake anddowntake headers for the water tubes, a steam and water drum,connections between the headers and the drum, a gas exit line having itsentrance above the connections between the uptake headers and the drum,said water tubes being divided into a lower bank extending across theboiler for the full width thereof and an upper bank at one side ofthesetting, a reheater above the lower bank and alon side the upper bank, a vertical dividing wa l betwmn the upper bank and the reheater andextending up to and into the gas exit flue, whereby the furnace gaseswill flow in a continuously generally upward direction over the lowerbankandthen into the passages formed by the vertical wall, a damper foreach passage at the upper end of the vertical wall, whereby the quantityof gases flowing through the respective passages may be regulated, anair heater to receive all the gases irrespective of the positions of thedamper, and ducts to lead heated air from the air heater to the boilercombustion chamber.

5. A steam boiler having horizontally inclined water tubes, said tubesbeing divided into a lower bank extending across the boiler for the fullwidth thereof and an upper bank at one side of the setting, a reheaterabove the lower bank and alongside the upper bank,

a vertical dividing wall between the upper 7 bank and the reheater andextending to the gas outlet of the boiler, a superheater at a lowerlevel than the bottom of said wall, a damper at the boiler gas outletfor the passage containing the reheater, and a damper at the boiler gasoutlet for the passage containing the upper bank.

6. In a steam boiler, spaced banks of boiler tubes, a primarysuperheater interposed between said banks, a re-heater above said banks,means for passing the gases over said primary superheater and saidre-heater, means for increasing or decreasin the temperature of saidre-heater without affecting the temperature of said superheater, andmeans for causing the gases to engage all of the superheater tubesacross the boiler under every condition of operation.

7. In a steam roller, spaced banks of boiler tubes, a primarysuperheater interposed between said banks, a re-heater above said banks,means for passing the gases over said primary superheater and saidre-heater, means for increasing or decreasing the heat applied to saidIve-heater without varying the heat applied to said superheater, andmeans for causing the gases to engage all of the superheater tubesacross the boiler under every condition of operation.

